Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
ky tang » ky dang, kho tang, ky trong
nam luc » nang luc, nhan luc, nam duoc
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
di cau » da cau, diem cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((ky tang) OR (ky nang)) xa hoi. lieu va ((nam luc) or (nam thuc)) va hang di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky tang) OR (ky nang)) xa hoi. lieu va ((nam luc) OR (nam thuc)) va hang di cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky tang) OR (ky nang)) xa hoi. lieu va ((nam luc) or (nam thuc)) va hang di cau tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky tang) OR (ky nang)) xa hoi. lieu va ((nam luc) or (nam thuc)) va hang di cau tren*.